BREEZE ROADS is a complete air dispersion modeling
suite that includes CALINE4, CAL3QHC, and CAL3QHCR models. These air dispersion
models are used within the software program to predict air quality impacts of
carbon monoxide (CO), nitrogen dioxide (NO2), particulate matter (PM), and
other inert pollutant concentrations from moving and idling motor vehicles at
or alongside roadways and roadway intersections. BREEZE ROADS is used in
conjunction with emissions data from MOBILE or other emissions models to
demonstrate compliance with National Ambient Air Quality Standards (NAAQS),
Federal Conformity Rules, the UK’s National Air Quality Strategy, and modeling
for highway site and design selection.
Most mobile source dispersion models predict air pollution
concentrations near roadways resulting from motor vehicles traveling under
free-flow conditions. BREEZE ROADS, however, is an enhanced version of the
CALINE series of models that incorporates methods for estimating queue lengths,
the contribution of emissions from idling vehicles, and the total air pollution
concentrations from both moving and idling vehicles.